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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * Copyright (c) 2006 Josef Cejka
  4.  * Copyright (c) 2009 Martin Decky
  5.  * All rights reserved.
  6.  *
  7.  * Redistribution and use in source and binary forms, with or without
  8.  * modification, are permitted provided that the following conditions
  9.  * are met:
  10.  *
  11.  * - Redistributions of source code must retain the above copyright
  12.  *   notice, this list of conditions and the following disclaimer.
  13.  * - Redistributions in binary form must reproduce the above copyright
  14.  *   notice, this list of conditions and the following disclaimer in the
  15.  *   documentation and/or other materials provided with the distribution.
  16.  * - The name of the author may not be used to endorse or promote products
  17.  *   derived from this software without specific prior written permission.
  18.  *
  19.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. /** @addtogroup generic
  32.  * @{
  33.  */
  34. /**
  35.  * @file
  36.  * @brief Printing functions.
  37.  */
  38.  
  39. #include <printf/printf_core.h>
  40. #include <print.h>
  41. #include <arch/arg.h>
  42. #include <macros.h>
  43. #include <string.h>
  44. #include <arch.h>
  45.  
  46. /** show prefixes 0x or 0 */
  47. #define __PRINTF_FLAG_PREFIX       0x00000001
  48. /** signed / unsigned number */
  49. #define __PRINTF_FLAG_SIGNED       0x00000002
  50. /** print leading zeroes */
  51. #define __PRINTF_FLAG_ZEROPADDED   0x00000004
  52. /** align to left */
  53. #define __PRINTF_FLAG_LEFTALIGNED  0x00000010
  54. /** always show + sign */
  55. #define __PRINTF_FLAG_SHOWPLUS     0x00000020
  56. /** print space instead of plus */
  57. #define __PRINTF_FLAG_SPACESIGN    0x00000040
  58. /** show big characters */
  59. #define __PRINTF_FLAG_BIGCHARS     0x00000080
  60. /** number has - sign */
  61. #define __PRINTF_FLAG_NEGATIVE     0x00000100
  62.  
  63. /**
  64.  * Buffer big enough for 64-bit number printed in base 2, sign, prefix and 0
  65.  * to terminate string... (last one is only for better testing end of buffer by
  66.  * zero-filling subroutine)
  67.  */
  68. #define PRINT_NUMBER_BUFFER_SIZE  (64 + 5)
  69.  
  70. /** Enumeration of possible arguments types.
  71.  */
  72. typedef enum {
  73.     PrintfQualifierByte = 0,
  74.     PrintfQualifierShort,
  75.     PrintfQualifierInt,
  76.     PrintfQualifierLong,
  77.     PrintfQualifierLongLong,
  78.     PrintfQualifierPointer
  79. } qualifier_t;
  80.  
  81. static char nullstr[] = "(NULL)";
  82. static char digits_small[] = "0123456789abcdef";
  83. static char digits_big[] = "0123456789ABCDEF";
  84.  
  85. /** Print one or more UTF-8 characters without adding newline.
  86.  *
  87.  * @param buf  Buffer holding UTF-8 characters with size of
  88.  *             at least size bytes. NULL is not allowed!
  89.  * @param size Size of the buffer in bytes.
  90.  * @param ps   Output method and its data.
  91.  *
  92.  * @return Number of UTF-8 characters printed.
  93.  *
  94.  */
  95. static int printf_putnchars_utf8(const char *buf, size_t size,
  96.     printf_spec_t *ps)
  97. {
  98.     return ps->write_utf8((void *) buf, size, ps->data);
  99. }
  100.  
  101. /** Print one or more UTF-32 characters without adding newline.
  102.  *
  103.  * @param buf  Buffer holding UTF-32 characters with size of
  104.  *             at least size bytes. NULL is not allowed!
  105.  * @param size Size of the buffer in bytes.
  106.  * @param ps   Output method and its data.
  107.  *
  108.  * @return Number of UTF-32 characters printed.
  109.  *
  110.  */
  111. static int printf_putnchars_utf32(const wchar_t *buf, size_t size,
  112.     printf_spec_t *ps)
  113. {
  114.     return ps->write_utf32((void *) buf, size, ps->data);
  115. }
  116.  
  117. /** Print string without adding newline.
  118.  *
  119.  * @param str   String to print.
  120.  * @param ps    Write function specification and support data.
  121.  *
  122.  * @return Number of characters printed.
  123.  *
  124.  */
  125. static int printf_putstr(const char *str, printf_spec_t *ps)
  126. {
  127.     if (str == NULL)
  128.         return printf_putnchars_utf8(nullstr, str_size(nullstr), ps);
  129.    
  130.     return ps->write_utf8((void *) str, str_size(str), ps->data);
  131. }
  132.  
  133. /** Print one ASCII character.
  134.  *
  135.  * @param c  ASCII character to be printed.
  136.  * @param ps Output method.
  137.  *
  138.  * @return Number of characters printed.
  139.  *
  140.  */
  141. static int printf_putchar(const char ch, printf_spec_t *ps)
  142. {
  143.     if (!ascii_check(ch))
  144.         return ps->write_utf8((void *) &invalch, 1, ps->data);
  145.    
  146.     return ps->write_utf8(&ch, 1, ps->data);
  147. }
  148.  
  149. /** Print one UTF-32 character.
  150.  *
  151.  * @param c  UTF-32 character to be printed.
  152.  * @param ps Output method.
  153.  *
  154.  * @return Number of characters printed.
  155.  *
  156.  */
  157. static int printf_putwchar(const wchar_t ch, printf_spec_t *ps)
  158. {
  159.     if (!unicode_check(ch))
  160.         return ps->write_utf8((void *) &invalch, 1, ps->data);
  161.    
  162.     return ps->write_utf32(&ch, sizeof(wchar_t), ps->data);
  163. }
  164.  
  165. /** Print one formatted ASCII character.
  166.  *
  167.  * @param ch    Character to print.
  168.  * @param width Width modifier.
  169.  * @param flags Flags that change the way the character is printed.
  170.  *
  171.  * @return Number of characters printed, negative value on failure.
  172.  *
  173.  */
  174. static int print_char(const char ch, int width, uint32_t flags, printf_spec_t *ps)
  175. {
  176.     count_t counter = 0;
  177.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  178.         while (--width > 0) {
  179.             /*
  180.              * One space is consumed by the character itself, hence
  181.              * the predecrement.
  182.              */
  183.             if (printf_putchar(' ', ps) > 0)
  184.                 counter++;
  185.         }
  186.     }
  187.    
  188.     if (printf_putchar(ch, ps) > 0)
  189.         counter++;
  190.    
  191.     while (--width > 0) {
  192.         /*
  193.          * One space is consumed by the character itself, hence
  194.          * the predecrement.
  195.          */
  196.         if (printf_putchar(' ', ps) > 0)
  197.             counter++;
  198.     }
  199.    
  200.     return (int) (counter + 1);
  201. }
  202.  
  203. /** Print one formatted UTF-32 character.
  204.  *
  205.  * @param ch    Character to print.
  206.  * @param width Width modifier.
  207.  * @param flags Flags that change the way the character is printed.
  208.  *
  209.  * @return Number of characters printed, negative value on failure.
  210.  *
  211.  */
  212. static int print_wchar(const wchar_t ch, int width, uint32_t flags, printf_spec_t *ps)
  213. {
  214.     count_t counter = 0;
  215.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  216.         while (--width > 0) {
  217.             /*
  218.              * One space is consumed by the character itself, hence
  219.              * the predecrement.
  220.              */
  221.             if (printf_putchar(' ', ps) > 0)
  222.                 counter++;
  223.         }
  224.     }
  225.    
  226.     if (printf_putwchar(ch, ps) > 0)
  227.         counter++;
  228.    
  229.     while (--width > 0) {
  230.         /*
  231.          * One space is consumed by the character itself, hence
  232.          * the predecrement.
  233.          */
  234.         if (printf_putchar(' ', ps) > 0)
  235.             counter++;
  236.     }
  237.    
  238.     return (int) (counter + 1);
  239. }
  240.  
  241. /** Format and print a string.
  242.  *
  243.  * @param str       String to be printed.
  244.  * @param width     Width modifier.
  245.  * @param precision Precision modifier.
  246.  * @param flags     Flags that modify the way the string is printed.
  247.  *
  248.  * @return Number of characters printed, negative value on failure.
  249.  */
  250. static int print_str(char *str, int width, unsigned int precision,
  251.     uint32_t flags, printf_spec_t *ps)
  252. {
  253.     if (str == NULL)
  254.         return printf_putstr(nullstr, ps);
  255.  
  256.     /* Print leading spaces. */
  257.     count_t strw = str_length(str);
  258.     if (precision == 0)
  259.         precision = strw;
  260.  
  261.     /* Left padding */
  262.     count_t counter = 0;
  263.     width -= precision;
  264.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  265.         while (width-- > 0) {
  266.             if (printf_putchar(' ', ps) == 1)
  267.                 counter++;
  268.         }
  269.     }
  270.  
  271.     /* Part of @a str fitting into the alloted space. */
  272.     int retval;
  273.     size_t size = str_wsize(str, precision);
  274.     if ((retval = printf_putnchars_utf8(str, size, ps)) < 0)
  275.         return -counter;
  276.  
  277.     counter += retval;
  278.  
  279.     /* Right padding */
  280.     while (width-- > 0) {
  281.         if (printf_putchar(' ', ps) == 1)
  282.             counter++;
  283.     }
  284.  
  285.     return ((int) counter);
  286.  
  287. }
  288.  
  289. /** Format and print a wide string.
  290.  *
  291.  * @param wstr      Wide string to be printed.
  292.  * @param width     Width modifier.
  293.  * @param precision Precision modifier.
  294.  * @param flags     Flags that modify the way the string is printed.
  295.  *
  296.  * @return      Number of characters printed, negative value
  297.  *          on failure.
  298.  */
  299. static int print_wstr(wchar_t *wstr, int width, unsigned int precision,
  300.     uint32_t flags, printf_spec_t *ps)
  301. {
  302.     if (wstr == NULL)
  303.         return printf_putstr(nullstr, ps);
  304.  
  305.     /* Print leading spaces. */
  306.     size_t strw = wstr_length(wstr);
  307.     if (precision == 0)
  308.         precision = strw;
  309.  
  310.     /* Left padding */
  311.     count_t counter = 0;
  312.     width -= precision;
  313.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  314.         while (width-- > 0) {
  315.             if (printf_putchar(' ', ps) == 1)
  316.                 counter++;
  317.         }
  318.     }
  319.  
  320.     /* Part of @a wstr fitting into the alloted space. */
  321.     int retval;
  322.     size_t size = wstr_wlength(wstr, precision) * sizeof(wchar_t);
  323.     if ((retval = printf_putnchars_utf32(wstr, size, ps)) < 0)
  324.         return -counter;
  325.  
  326.     counter += retval;
  327.  
  328.     /* Right padding */
  329.     while (width-- > 0) {
  330.         if (printf_putchar(' ', ps) == 1)
  331.             counter++;
  332.     }
  333.  
  334.     return ((int) counter);
  335. }
  336.  
  337. /** Print a number in a given base.
  338.  *
  339.  * Print significant digits of a number in given base.
  340.  *
  341.  * @param num       Number to print.
  342.  * @param width     Width modifier.
  343.  * @param precision Precision modifier.
  344.  * @param base      Base to print the number in (must be between 2 and 16).
  345.  * @param flags     Flags that modify the way the number is printed.
  346.  *
  347.  * @return Number of characters printed.
  348.  *
  349.  */
  350. static int print_number(uint64_t num, int width, int precision, int base,
  351.     uint32_t flags, printf_spec_t *ps)
  352. {
  353.     char *digits;
  354.     if (flags & __PRINTF_FLAG_BIGCHARS)
  355.         digits = digits_big;
  356.     else
  357.         digits = digits_small;
  358.    
  359.     char data[PRINT_NUMBER_BUFFER_SIZE];
  360.     char *ptr = &data[PRINT_NUMBER_BUFFER_SIZE - 1];
  361.    
  362.     /* Size of number with all prefixes and signs */
  363.     int size = 0;
  364.    
  365.     /* Put zero at end of string */
  366.     *ptr-- = 0;
  367.    
  368.     if (num == 0) {
  369.         *ptr-- = '0';
  370.         size++;
  371.     } else {
  372.         do {
  373.             *ptr-- = digits[num % base];
  374.             size++;
  375.         } while (num /= base);
  376.     }
  377.    
  378.     /* Size of plain number */
  379.     int number_size = size;
  380.    
  381.     /*
  382.      * Collect the sum of all prefixes/signs/etc. to calculate padding and
  383.      * leading zeroes.
  384.      */
  385.     if (flags & __PRINTF_FLAG_PREFIX) {
  386.         switch(base) {
  387.         case 2:
  388.             /* Binary formating is not standard, but usefull */
  389.             size += 2;
  390.             break;
  391.         case 8:
  392.             size++;
  393.             break;
  394.         case 16:
  395.             size += 2;
  396.             break;
  397.         }
  398.     }
  399.    
  400.     char sgn = 0;
  401.     if (flags & __PRINTF_FLAG_SIGNED) {
  402.         if (flags & __PRINTF_FLAG_NEGATIVE) {
  403.             sgn = '-';
  404.             size++;
  405.         } else if (flags & __PRINTF_FLAG_SHOWPLUS) {
  406.             sgn = '+';
  407.             size++;
  408.         } else if (flags & __PRINTF_FLAG_SPACESIGN) {
  409.             sgn = ' ';
  410.             size++;
  411.         }
  412.     }
  413.    
  414.     if (flags & __PRINTF_FLAG_LEFTALIGNED)
  415.         flags &= ~__PRINTF_FLAG_ZEROPADDED;
  416.    
  417.     /*
  418.      * If the number is left-aligned or precision is specified then
  419.      * padding with zeros is ignored.
  420.      */
  421.     if (flags & __PRINTF_FLAG_ZEROPADDED) {
  422.         if ((precision == 0) && (width > size))
  423.             precision = width - size + number_size;
  424.     }
  425.    
  426.     /* Print leading spaces. */
  427.     if (number_size > precision) {
  428.         /* Print the whole number, not only a part. */
  429.         precision = number_size;
  430.     }
  431.    
  432.     width -= precision + size - number_size;
  433.     count_t counter = 0;
  434.    
  435.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  436.         while (width-- > 0) {
  437.             if (printf_putchar(' ', ps) == 1)
  438.                 counter++;
  439.         }
  440.     }
  441.    
  442.     /* Print sign. */
  443.     if (sgn) {
  444.         if (printf_putchar(sgn, ps) == 1)
  445.             counter++;
  446.     }
  447.    
  448.     /* Print prefix. */
  449.     if (flags & __PRINTF_FLAG_PREFIX) {
  450.         switch(base) {
  451.         case 2:
  452.             /* Binary formating is not standard, but usefull */
  453.             if (printf_putchar('0', ps) == 1)
  454.                 counter++;
  455.             if (flags & __PRINTF_FLAG_BIGCHARS) {
  456.                 if (printf_putchar('B', ps) == 1)
  457.                     counter++;
  458.             } else {
  459.                 if (printf_putchar('b', ps) == 1)
  460.                     counter++;
  461.             }
  462.             break;
  463.         case 8:
  464.             if (printf_putchar('o', ps) == 1)
  465.                 counter++;
  466.             break;
  467.         case 16:
  468.             if (printf_putchar('0', ps) == 1)
  469.                 counter++;
  470.             if (flags & __PRINTF_FLAG_BIGCHARS) {
  471.                 if (printf_putchar('X', ps) == 1)
  472.                     counter++;
  473.             } else {
  474.                 if (printf_putchar('x', ps) == 1)
  475.                     counter++;
  476.             }
  477.             break;
  478.         }
  479.     }
  480.    
  481.     /* Print leading zeroes. */
  482.     precision -= number_size;
  483.     while (precision-- > 0) {
  484.         if (printf_putchar('0', ps) == 1)
  485.             counter++;
  486.     }
  487.    
  488.     /* Print the number itself. */
  489.     int retval;
  490.     if ((retval = printf_putstr(++ptr, ps)) > 0)
  491.         counter += retval;
  492.    
  493.     /* Print tailing spaces. */
  494.    
  495.     while (width-- > 0) {
  496.         if (printf_putchar(' ', ps) == 1)
  497.             counter++;
  498.     }
  499.    
  500.     return ((int) counter);
  501. }
  502.  
  503. /** Print formatted string.
  504.  *
  505.  * Print string formatted according to the fmt parameter and variadic arguments.
  506.  * Each formatting directive must have the following form:
  507.  *
  508.  *  \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
  509.  *
  510.  * FLAGS:@n
  511.  *  - "#" Force to print prefix. For \%o conversion, the prefix is 0, for
  512.  *        \%x and \%X prefixes are 0x and 0X and for conversion \%b the
  513.  *        prefix is 0b.
  514.  *
  515.  *  - "-" Align to left.
  516.  *
  517.  *  - "+" Print positive sign just as negative.
  518.  *
  519.  *  - " " If the printed number is positive and "+" flag is not set,
  520.  *        print space in place of sign.
  521.  *
  522.  *  - "0" Print 0 as padding instead of spaces. Zeroes are placed between
  523.  *        sign and the rest of the number. This flag is ignored if "-"
  524.  *        flag is specified.
  525.  *
  526.  * WIDTH:@n
  527.  *  - Specify the minimal width of a printed argument. If it is bigger,
  528.  *    width is ignored. If width is specified with a "*" character instead of
  529.  *    number, width is taken from parameter list. And integer parameter is
  530.  *    expected before parameter for processed conversion specification. If
  531.  *    this value is negative its absolute value is taken and the "-" flag is
  532.  *    set.
  533.  *
  534.  * PRECISION:@n
  535.  *  - Value precision. For numbers it specifies minimum valid numbers.
  536.  *    Smaller numbers are printed with leading zeroes. Bigger numbers are not
  537.  *    affected. Strings with more than precision characters are cut off. Just
  538.  *    as with width, an "*" can be used used instead of a number. An integer
  539.  *    value is then expected in parameters. When both width and precision are
  540.  *    specified using "*", the first parameter is used for width and the
  541.  *    second one for precision.
  542.  *
  543.  * TYPE:@n
  544.  *  - "hh" Signed or unsigned char.@n
  545.  *  - "h"  Signed or unsigned short.@n
  546.  *  - ""   Signed or unsigned int (default value).@n
  547.  *  - "l"  Signed or unsigned long int.@n
  548.  *         If conversion is "c", the character is wchar_t (UTF-32).@n
  549.  *         If conversion is "s", the string is wchar_t * (UTF-32).@n
  550.  *  - "ll" Signed or unsigned long long int.@n
  551.  *
  552.  * CONVERSION:@n
  553.  *  - % Print percentile character itself.
  554.  *
  555.  *  - c Print single character. The character is expected to be plain
  556.  *      ASCII (e.g. only values 0 .. 127 are valid).@n
  557.  *      If type is "l", then the character is expected to be UTF-32
  558.  *      (e.g. values 0 .. 0x10ffff are valid).
  559.  *
  560.  *  - s Print zero terminated string. If a NULL value is passed as
  561.  *      value, "(NULL)" is printed instead.@n
  562.  *      The string is expected to be correctly encoded UTF-8 (or plain
  563.  *      ASCII, which is a subset of UTF-8).@n
  564.  *      If type is "l", then the string is expected to be correctly
  565.  *      encoded UTF-32.
  566.  *
  567.  *  - P, p Print value of a pointer. Void * value is expected and it is
  568.  *         printed in hexadecimal notation with prefix (as with \%#X / \%#x
  569.  *         for 32-bit or \%#X / \%#x for 64-bit long pointers).
  570.  *
  571.  *  - b Print value as unsigned binary number. Prefix is not printed by
  572.  *      default. (Nonstandard extension.)
  573.  *
  574.  *  - o Print value as unsigned octal number. Prefix is not printed by
  575.  *      default.
  576.  *
  577.  *  - d, i Print signed decimal number. There is no difference between d
  578.  *         and i conversion.
  579.  *
  580.  *  - u Print unsigned decimal number.
  581.  *
  582.  *  - X, x Print hexadecimal number with upper- or lower-case. Prefix is
  583.  *         not printed by default.
  584.  *
  585.  * All other characters from fmt except the formatting directives are printed
  586.  * verbatim.
  587.  *
  588.  * @param fmt Format string.
  589.  * @return Number of characters printed, negative value on failure.
  590.  *
  591.  */
  592. int printf_core(const char *fmt, printf_spec_t *ps, va_list ap)
  593. {
  594.     size_t i = 0;  /* Index of the currently processed character from fmt */
  595.     size_t nxt = 0;
  596.     size_t j = 0;  /* Index to the first not printed nonformating character */
  597.    
  598.     wchar_t uc;           /* Current character decoded from fmt */
  599.     count_t counter = 0;  /* Number of characters printed */
  600.     int retval;           /* Return values from nested functions */
  601.    
  602.     while (true) {
  603.         i = nxt;
  604.         uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  605.  
  606.         if (uc == '\0') break;
  607.  
  608.         /* Control character */
  609.         if (uc == '%') {
  610.             /* Print common characters if any processed */
  611.             if (i > j) {
  612.                 if ((retval = printf_putnchars_utf8(&fmt[j], i - j, ps)) < 0) {
  613.                     /* Error */
  614.                     counter = -counter;
  615.                     goto out;
  616.                 }
  617.                 counter += retval;
  618.             }
  619.            
  620.             j = i;
  621.            
  622.             /* Parse modifiers */
  623.             uint32_t flags = 0;
  624.             bool end = false;
  625.            
  626.             do {
  627.                 i = nxt;
  628.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  629.                 switch (uc) {
  630.                 case '#':
  631.                     flags |= __PRINTF_FLAG_PREFIX;
  632.                     break;
  633.                 case '-':
  634.                     flags |= __PRINTF_FLAG_LEFTALIGNED;
  635.                     break;
  636.                 case '+':
  637.                     flags |= __PRINTF_FLAG_SHOWPLUS;
  638.                     break;
  639.                 case ' ':
  640.                     flags |= __PRINTF_FLAG_SPACESIGN;
  641.                     break;
  642.                 case '0':
  643.                     flags |= __PRINTF_FLAG_ZEROPADDED;
  644.                     break;
  645.                 default:
  646.                     end = true;
  647.                 };
  648.             } while (!end);
  649.            
  650.             /* Width & '*' operator */
  651.             int width = 0;
  652.             if (isdigit(uc)) {
  653.                 while (true) {
  654.                     width *= 10;
  655.                     width += uc - '0';
  656.  
  657.                     i = nxt;
  658.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  659.                     if (uc == '\0')
  660.                         break;
  661.                     if (!isdigit(uc))
  662.                         break;
  663.                 }
  664.             } else if (uc == '*') {
  665.                 /* Get width value from argument list */
  666.                 i = nxt;
  667.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  668.                 width = (int) va_arg(ap, int);
  669.                 if (width < 0) {
  670.                     /* Negative width sets '-' flag */
  671.                     width *= -1;
  672.                     flags |= __PRINTF_FLAG_LEFTALIGNED;
  673.                 }
  674.             }
  675.            
  676.             /* Precision and '*' operator */
  677.             int precision = 0;
  678.             if (uc == '.') {
  679.                 i = nxt;
  680.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  681.                 if (isdigit(uc)) {
  682.                     while (true) {
  683.                         precision *= 10;
  684.                         precision += uc - '0';
  685.  
  686.                         i = nxt;
  687.                         uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  688.                         if (uc == '\0')
  689.                             break;
  690.                         if (!isdigit(uc))
  691.                             break;
  692.                     }
  693.                 } else if (uc == '*') {
  694.                     /* Get precision value from the argument list */
  695.                     i = nxt;
  696.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  697.                     precision = (int) va_arg(ap, int);
  698.                     if (precision < 0) {
  699.                         /* Ignore negative precision */
  700.                         precision = 0;
  701.                     }
  702.                 }
  703.             }
  704.            
  705.             qualifier_t qualifier;
  706.            
  707.             switch (uc) {
  708.             /** @todo Unimplemented qualifiers:
  709.              *        t ptrdiff_t - ISO C 99
  710.              */
  711.             case 'h':
  712.                 /* Char or short */
  713.                 qualifier = PrintfQualifierShort;
  714.                 i = nxt;
  715.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  716.                 if (uc == 'h') {
  717.                     i = nxt;
  718.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  719.                     qualifier = PrintfQualifierByte;
  720.                 }
  721.                 break;
  722.             case 'l':
  723.                 /* Long or long long */
  724.                 qualifier = PrintfQualifierLong;
  725.                 i = nxt;
  726.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  727.                 if (uc == 'l') {
  728.                     i = nxt;
  729.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  730.                     qualifier = PrintfQualifierLongLong;
  731.                 }
  732.                 break;
  733.             default:
  734.                 /* Default type */
  735.                 qualifier = PrintfQualifierInt;
  736.             }
  737.            
  738.             unsigned int base = 10;
  739.            
  740.             switch (uc) {
  741.             /*
  742.              * String and character conversions.
  743.              */
  744.             case 's':
  745.                 if (qualifier == PrintfQualifierLong)
  746.                     retval = print_wstr(va_arg(ap, wchar_t *), width, precision, flags, ps);
  747.                 else
  748.                     retval = print_str(va_arg(ap, char *), width, precision, flags, ps);
  749.                
  750.                 if (retval < 0) {
  751.                     counter = -counter;
  752.                     goto out;
  753.                 }
  754.                
  755.                 counter += retval;
  756.                 j = nxt;
  757.                 goto next_char;
  758.             case 'c':
  759.                 if (qualifier == PrintfQualifierLong)
  760.                     retval = print_wchar(va_arg(ap, wchar_t), width, flags, ps);
  761.                 else
  762.                     retval = print_char(va_arg(ap, unsigned int), width, flags, ps);
  763.                
  764.                 if (retval < 0) {
  765.                     counter = -counter;
  766.                     goto out;
  767.                 };
  768.                
  769.                 counter += retval;
  770.                 j = nxt;
  771.                 goto next_char;
  772.            
  773.             /*
  774.              * Integer values
  775.              */
  776.             case 'P':
  777.                 /* Pointer */
  778.                 flags |= __PRINTF_FLAG_BIGCHARS;
  779.             case 'p':
  780.                 flags |= __PRINTF_FLAG_PREFIX;
  781.                 base = 16;
  782.                 qualifier = PrintfQualifierPointer;
  783.                 break;
  784.             case 'b':
  785.                 base = 2;
  786.                 break;
  787.             case 'o':
  788.                 base = 8;
  789.                 break;
  790.             case 'd':
  791.             case 'i':
  792.                 flags |= __PRINTF_FLAG_SIGNED;
  793.             case 'u':
  794.                 break;
  795.             case 'X':
  796.                 flags |= __PRINTF_FLAG_BIGCHARS;
  797.             case 'x':
  798.                 base = 16;
  799.                 break;
  800.            
  801.             /* Percentile itself */
  802.             case '%':
  803.                 j = i;
  804.                 goto next_char;
  805.            
  806.             /*
  807.              * Bad formatting.
  808.              */
  809.             default:
  810.                 /*
  811.                  * Unknown format. Now, j is the index of '%'
  812.                  * so we will print whole bad format sequence.
  813.                  */
  814.                 goto next_char;
  815.             }
  816.            
  817.             /* Print integers */
  818.             size_t size;
  819.             uint64_t number;
  820.             switch (qualifier) {
  821.             case PrintfQualifierByte:
  822.                 size = sizeof(unsigned char);
  823.                 number = (uint64_t) va_arg(ap, unsigned int);
  824.                 break;
  825.             case PrintfQualifierShort:
  826.                 size = sizeof(unsigned short);
  827.                 number = (uint64_t) va_arg(ap, unsigned int);
  828.                 break;
  829.             case PrintfQualifierInt:
  830.                 size = sizeof(unsigned int);
  831.                 number = (uint64_t) va_arg(ap, unsigned int);
  832.                 break;
  833.             case PrintfQualifierLong:
  834.                 size = sizeof(unsigned long);
  835.                 number = (uint64_t) va_arg(ap, unsigned long);
  836.                 break;
  837.             case PrintfQualifierLongLong:
  838.                 size = sizeof(unsigned long long);
  839.                 number = (uint64_t) va_arg(ap, unsigned long long);
  840.                 break;
  841.             case PrintfQualifierPointer:
  842.                 size = sizeof(void *);
  843.                 number = (uint64_t) (unsigned long) va_arg(ap, void *);
  844.                 break;
  845.             default:
  846.                 /* Unknown qualifier */
  847.                 counter = -counter;
  848.                 goto out;
  849.             }
  850.            
  851.             if (flags & __PRINTF_FLAG_SIGNED) {
  852.                 if (number & (0x1 << (size * 8 - 1))) {
  853.                     flags |= __PRINTF_FLAG_NEGATIVE;
  854.                    
  855.                     if (size == sizeof(uint64_t)) {
  856.                         number = -((int64_t) number);
  857.                     } else {
  858.                         number = ~number;
  859.                         number &=
  860.                             ~(0xFFFFFFFFFFFFFFFFll <<
  861.                             (size * 8));
  862.                         number++;
  863.                     }
  864.                 }
  865.             }
  866.            
  867.             if ((retval = print_number(number, width, precision,
  868.                 base, flags, ps)) < 0) {
  869.                 counter = -counter;
  870.                 goto out;
  871.             }
  872.            
  873.             counter += retval;
  874.             j = nxt;
  875.         }
  876. next_char:
  877.         ;
  878.     }
  879.    
  880.     if (i > j) {
  881.         if ((retval = printf_putnchars_utf8(&fmt[j], i - j, ps)) < 0) {
  882.             /* Error */
  883.             counter = -counter;
  884.             goto out;
  885.         }
  886.         counter += retval;
  887.     }
  888.    
  889. out:
  890.     return ((int) counter);
  891. }
  892.  
  893. /** @}
  894.  */
  895.